Answer in brief
CVE-2026-23240 records a Critical severity (CVSS 9.8) vulnerability in tls: Fix race condition in tls_sw_cancel_work_tx(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=f87e62d45e51b12d48d2cb46b5cde8f83b866bc4 <a5de36d6cee74a92c1a21b260bc507e64bc451de || >=f87e62d45e51b12d48d2cb46b5cde8f83b866bc4 <854cd32bc74fe573353095e90958490e4e4d641b || >=f87e62d45e51b12d48d2cb46b5cde8f83b866bc4 <17153f154f80be2b47ebf52840f2d8f724eb2f3b || >=f87e62d45e51b12d48d2cb46b5cde8f83b866bc4 <7bb09315f93dce6acc54bf59e5a95ba7365c2be4 | a5de36d6cee74a92c1a21b260bc507e64bc451de, 854cd32bc74fe573353095e90958490e4e4d641b, 17153f154f80be2b47ebf52840f2d8f724eb2f3b, 7bb09315f93dce6acc54bf59e5a95ba7365c2be4 |
| Linux/Linuxgeneric | 5.3 | Not reported |
Published upstream
Mar 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 16, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 16, 2026
In the Linux kernel, the following vulnerability has been resolved: tls: Fix race condition in tls_sw_cancel_work_tx() This issue was discovered during a code audit. After cancel_delayed_work_sync() is called from tls_sk_proto_close(), tx_work_handler() can still be scheduled from paths such as the Delayed ACK handler or ksoftirqd. As a result, the tx_work_handler() worker may dereference a freed TLS object. The following is a simple race scenario: cpu0 cpu1 tls_sk_proto_close() tls_sw_cancel_work_tx() tls_write_space() tls_sw_write_space() if (!test_and_set_bit(BIT_TX_SCHEDULED, &tx_ctx->tx_bitmask)) set_bit(BIT_TX_SCHEDULED, &ctx->tx_bitmask); cancel_delayed_work_sync(&ctx->tx_work.work); schedule_delayed_work(&tx_ctx->tx_work.work, 0); To prevent this race condition, cancel_delayed_work_sync() is replaced with disable_delayed_work_sync().
Quoted source text, attributed separately from HOL analysis.